Maybe we can implement a middle man npc to resolve over max meso trade scams. Where two users can put up items to the middleman npc and items are only given over when players reviewed and accept. Fredrick can hold over max meso for items sold over in the shop so I would assume this viable. But I think a meso token is the best and easiest solution to solve these scams but for whatever reason it's not implementable this could be another solution.